x86: HPET: convert WARN_ON to WARN_ON_ONCE
x86: HPET: convert WARN_ON to WARN_ON_ONCE

It is possible to flood the console with call traces if the WARN_ON
condition is true because of the frequency with which this function is
called.

Signed-off-by: Matt Fleming <e6e87cca744b494a69d072753bfc4ab4f9f4fb65@gentoo.org>
Cc: 9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu
Cc: 6b7ddbe82beec4500037cfc9bc14de0a76fca340@intel.com
Signed-off-by: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs